Sen. Joe Biden campaigns in Virginia (22 images)

Sen. Barbara Mikulski (D-MD) speaks prior to Democratic vice presidential candidate Sen. Joe Biden (D-DE) arriving at a campaign rally at Claude Moore Park in Sterling, Virginia on September 19, 2008. (UPI Photo/Alexis C. Glenn)

Democratic vice presidential candidate Sen. Joe Biden (D-DE) speaks at a campaign rally at Claude Moore Park in Sterling, Virginia on September 19, 2008. (UPI Photo/Alexis C. Glenn)